[jeffcoslacker]

Well...the EGR hasn't been operating at all, or it would look the same on both passages...that being said, that stuff is obviously not normal....I don't know if it's coolant residue or just the result of condensation, intake vapors (fuel and oil) and rust...but the consistancy and color are sure similar to what you get when you have oil and coolant mixing...

This is really puzzling, but it's a good thing you had a look before doing anything else...

Does your car have the red extended life coolant in it, or the conventional green antifreeze?

The green stuff will poison o2 sensors if it makes it into the exhaust, is why I ask...the red will not, as far as I know...but I'd think it would ruin the pre-cat first...

I'll keep thinking...